LYGINODENDRON 399 



when young, but opening out later, and then assuming 

 the fringe-like arrangement. They are about 3 mm. 

 long and 1.5 mm. in maximum width, while each 

 loculus has a diameter of about .5 mm. 



No evidence of cohesion among the sporangia was 

 observed, but each " bilocular sporangium " may be 

 interpreted as a synangium, though this does not appear 

 to be Mr. Kidston's view. The nature of the preserva- 

 tion is such as to leave the detailed morphology 

 somewhat uncertain. The microspores were still con- 

 tained in the cavities of the sporangia, and could be 

 studied in some detail. Each spore has a distinct 

 triradiate ridge, indicating tetrahedral development, and 

 the surface of the outer wall is rough with minute 

 points. The diameter of the spore varies from .05 to 

 .07 mm. 



Mr. Kidston finds that " the cleft by which dehiscence 

 took place passed longitudinally down the centre of 

 the inner face of the microsporangium, and thus 

 the microspores of both loculi would be liberated 

 simultaneously." 



Mr. Kidston observed in the Dudley nodules, another 

 species of Crossotheca, C. Hughesiana, which has cordate 

 fertile pinnules, but is otherwise closely similar to C. 

 Honinghausi. 



Shortly before Mr. Kidston's discovery of the con- 

 nection between Crossotheca and Lyginodendron, Miss 

 M. Benson, D.Sc, described a fructification [Telangium 

 Scotti) with structure preserved, from the Coal-measure 

 nodules, and was inclined to attribute it to Lyginodendron} 



1 Benson, " Telangium Scotti," Ann. of Bot. vol. xviii. 1904. A 

 preliminary note was published two years earlier. 



